Cylinder lock



June 17, 1941. R. A. SPEER I 2,246,112

CYLINDER LOCK Filed Aug. 1, 1940 2 Sheets-Sheet l Ry N I Inventor Y J Roberf 5,0 9

A ttorney June 17, 1941. R, A, SPEER I 2,246,112

CYLINDER LOCK I Filed Aug. 1, 1940 2 Sheets-Sheet 2 ROberTA J/aeel A iiorney Patentecl June 17, 1941 UNITED STATES PATENT ()FFlCE- CYLINDER LOCK Robert A. Speer, Detroit, Mich.

Application August 1, 1940, Serial No. 349,272

2 Claims.

This invention relates to a cylinder lock, the general object of the invention being to provide means whereby it is practically impossible for one to pick or unlock the member which is locked by the device without the use of a key, made for the look.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts tobe hereinafter fully described, illustrated in the accompanying drawings and specifically pointed. out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which:

Figure 1 is an elevational view of the lock.

Figure 2 is a front view thereof.

Figure 3 is a rear view thereof.

Figure 4 is a longitudinal sectional view through the lock.

Figure 5 is a section on the line 5-5 of Figure 2.

Figure 6 is a view of the rear end of the lock with the cam removed.

Figure 7 is a transverse sectional view through Figure 1.

Figures 8, 9 and 10 are transverse sectional views showing the two parts forming the invention in different positions.

Figure 11 is a perspective view of the improved cylinder part of the lock in perspective.

In these views the numeral I indicates the cylindrical body of the lock which has a cylindrical bore 2 passing therethrough with its front end enlarged and a sectional cylinder 3 is rotatably arranged in the bore, the front end of the cylinder having a circular enlargement 4 thereon for fitting in the enlarged front end of the bore and a circular plate 5 is connected to the rear end of the cylinder by the tongues B and this plate 5 is connected by the bolts 1 to the cam 8 which has the arm 9 thereon for operating a locking bolt or the like, such as shown at It in dotted lines in Figure 3.

As before stated, this cylinder is of sectional form and includes the main part II having the keyhole slot l3 passing therethrough and the rear end of this part II has the tongues 6 thereon for holding the plate 5 to the rear end thereof. The rear portion of this part II is formed with a circular longitudinally extending chamber l4 and a wide longitudinally extending slot l5 connects the chamber with the exterior of the cylinder and the second section It rotatably fits in the chamber and is held against longitudinal movement therein by the plate 5 and this part I6 is provided with an enlargement I! for passing through the slot l5, the enlargement being of such size that it will permit limited rotary movement of the section I 6 in the chamber of the section II.

The body I is formed with a row of holes [8 therein which pass through a fiat part of the circumference of the body and these holes receive the plungers l9 and their springs 20, a plate 2| extending over the hole carrying part to hold the springs and plungers in place. The section II is provided with a pair of holes 22 adapted to receive two of the plungers when the plungers are projected by the springs and the section It is provided with three holes 23 for receiving the other plungers. This section I6 is also formed with a keyhole slot 24 which extends longitudinally therethrough and this slot 24 is of greater width than the slot l3 in section I I, see Figure 5.

When the parts are in looking position the two sections II and I6 of the cylinder 3 have their slots I3 and 24 in alignment so that when a proper size key is introduced into the cylinder 3 all the plungers will be raised so that the cylinder 3 can be turned by the key in the usual manner. Then when the cylinder 3 is turned to locking position and the key is moved all the plungers I9 will enter the holes 22 and 23 and thus the cylinder is locked against movement.

If an attempt should be made to pick the lock the lock picking tool when inserted in the keyhole I3 in section H, in an attempt to turn the cylinder, the inner section I6 will not rotate even though the section II has been rotated by the tool lifting the plungers which engage the holes thereof. Thus the section "5 cannot be turned by a picking tool even though the parts might be picked to an extent that will permit the section II to be turned. This will also prevent the key from being inserted into the section l6 as the keyholes of the two sections will be out of alignment. Also by making the keyhole 24 wider than the keyhole l3 there is no chance of wedging the parts together by inserting a wedge in the keyholes. Even if the plungers engaging the holes of section l6 could be raised they will drop back into place through the holes in the section l6 as soon as the pick or false key is withdrawn as, of course, this section It will not be turned with the section I l.

The top of the keyhole 24 as shown in Figs. 8 and 9 is made of less width than the remaining portion and of practically the same width as the keyhole l3 so that the key when placed in the lock will elevate the pins Without the pins slipping from the key.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts provided that such changes fall within the scope of the appended claims.

Having described the claimed as new is:

1. In a cylindrical look, a body having a bore passing therethrough, said body having a longitudinally extending row of holes therein, plungers in the holes, springs for pressing the plungers inwardly, a sectional cylinder rotatably arranged in the bore and the sections of which have holes therein for receiving the plungers when the holes in the two sections are in alignment and the cylinder turned to register the holes with the plungers, one section being supported invention, what is for rotary movement in the other section, and said other section having an opening therein for receiving the hole carrying part of said one section with said hole carrying part of smaller width than said opening to permit a certain a sectional cylinder rotatably arranged in thebore and including a main section having a circular chamber in its inner portion and a slot passing through a side wall of the main section and in communication with the chamber, a second section rotatably arranged in the chamber and having an enlargement passing through the slot and of less width than the slot, said enlargement having holes therein for receiving plungers and the main section at its front portion having holes therein for receiving others of the plungers, a keyhole in both sections, the keyhole of the second section being'of greater width than the keyhole of the first section.

ROBERT A. SPEER. 

